Which two elements are in the same group based on their atomic model?
Please help me with this ASAP.

Answer:

i believe it is c

evaporation

Explanation:

Hope it's the correct one if not very sorry.

Answer:It’s cyclone movement

Explanation:

Answer: Luster: Metals are shiny when cut, scratched, or polished.

Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped.

Conductivity: Metals are excellent conductors of electricity and heat.

Explanation: Hope this helped!

Answer:

What are 3 physical properties of nitrogen?

Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09 percent of Earth's atmosphere by volume.

What are 2 chemical properties of nitrogen?

Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09 percent of Earth's atmosphere by volume. Nitrogen gas is an industrial gas produced by the fractional distillation of liquid air or by mechanical means using gaseous air.

Wavelength = Speed of Light ÷ Frequency

                     = (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)

                     = 1.22 × 10⁻¹ m

The wavelength of a light of frequency   2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.

Notes:

Hz ≡ /s

Americans breathe less pollution and face lower risks of premature death and other serious health effects. Environmental damage from air pollution is reduced. The value of Clean Air Act health benefits far exceeds the costs of reducing pollution. ... New plants and factories install modern pollution control technology.

Answer:

Copper = Cu

Gold = Ag

Iron = Fe

Potassium = K

the correct one is D

laboratory safety rules:

~Avoid wye contact with all chemics

~ Avoid skin contact with all chemicals

~Always wear safety glasses

~Don't eat in the lab

~Don't drink anything in the lab

~Avoid wearing jewellery

~Don't taste or sniff any chemicals

~Kn0w emergency exit routes

~Never leave containers of chemicals open

~Avoid distracting anyone else working in the lab

Hope this helped you- have a good day bro cya)

Answer:

Explanation:

a. NaCl+ AgNO3-----> NaNO3+ AgCl

b. Số mol của NaCl= 0,2*0,5= 0,1 (mol)

------> Số mol của kết tủa AgCl tạo thành= 0,1 mol (dựa vào phương trình hóa học)

-----> Khối lượng của kết tủa AgCl tạo thành= 0,1*143,5=14,35(g)

c. Số mol của AgNO3= số mol của NaCl= 0,1 (mol)

------> Nồng độ mol của dd AgNO3 đã tham gia phản ứng= [tex]\frac{0,1}{0,4}[/tex]=0,25(M)

Answer:

the "goldilocks zone" is the habitable zone around a star where it's not too hot and not too cold, so liquid water and life can exist on the planets in this zone.

Explanation:

The distance Earth orbits the Sun is just right for water to remain a liquid and for life to not be frozen or fried. This distance from the Sun is called the habitable zone, or the Goldilocks zone.

Answer:

1. Decomposition of stone due to acid rain.

3. The pink color of a rose.

Explanation:

Chemical changes always end up with new products in an equation, or it has always something to do with chemicals. Physical changes on the other hand, do not result in new products and it just changes the physical properties and physical state of matter of the object.

Answer:

Sorry pal! Didn't understand your language.  

:(

Explanation:

Answer:

Option C

Explanation:

Its totally chemical change

Answer:

b

Explanation:

Answer:

D

Explanation:

Its D

Answer:

Its d for edge

Explanation:

Answer:

Freezing and condensation

Explanation:

Because they are exothermic, they release energy

Density = mass ÷ volume  

           = 217.0 g ÷ 24.3 cm³  

           = 8.93 g/cm³

∴ the unknown sample of mass 217.0 grams and volume of 24.3 cm³ has a density of 8.93 g/cm³.

Answer:1, 2, and 4

Explanation:

covalent bonds are not ionic.  the elements SHARE electrons

Which of the following are properties of compounds formed by covalent bonding (Select all that apply)  

1. When you dissolve an covalent compound in water, the solution does not conduct electricity.

2. Covalent compounds often have lower melting points than ionic compounds.

3. When you dissolve an covalent compound in water, the solution conducts electricity.

4. Covalent compounds form when combining two or more nonmetal atoms.

5. Covalent compounds form when combining a two metal atoms.

6. Covalent compounds form when combining a metal atom with a nonmetal atom.

The properties of covalent compounds are option 2, 3 and 4. Covalent bonds are weaker than ionic bonds.

Covalent bonds are formed by sharing electrons between two atoms. Non metals with comparable electronegativities forms covalent bonds. They are weaker than ionic bond. Thus have lower melting point.

Melting point depends on the bond strength that's why covalent compounds have lower melting point compared with ionic bonds.

Polar covalent bonds can conduct electricity when dissolved in water because of the presence of free electrons. Thus option 3 is correct.

Hence, the properties in option 2, 3 and 4 are correct for covalent compounds.

To  learn more about covalent compound, refer the link below:

https://brainly.com/question/21505413

#SPJ2

Explanation:

Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons. Sodium atoms have 11 electrons. Two of these are in the lowest energy level, eight are in the second energy level and then one electron is in the third energy level.

Any atom is most stable when it’s outermost energy level contains eight electrons.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

Learn more about atom,here:

https://brainly.com/question/13981855

#SPJ6

Answer:

a molecule is a group of atoms/elements bonded together

Answer:

a) II and III

is the correct

Answer:

it is placed over a bunsen burner to heat up and remove all bacteria

Explanation:

Answer:

3.39e+20

Explanation:

Answer:

(Hope this helps can I pls have brainlist (crown)☺️)

Explanation:

Dalton turned Democritus' views on atoms into a scientific theory by employing experimental methods. Atoms can join or detach during chemical processes, but they never transform into a different atom.

Dalton was an excellent polymath, a natural philosopher, and a real scientist. His thorough investigations prompted him to suggest an early atomic theory for which exceptions would be difficult to uncover today:

Dalton offered the following:

Atoms are microscopic particles that make up elements. Atoms of the same element have the same size and mass; however, atoms of other elements have varying sizes and masses when compared to atoms of other elements. Subdivision, creation, and destruction of atoms are all impossible.

All of these ideas were developed after a great deal of testing. Other researchers may replicate his work, and new findings could be included into this atomic idea.

Democritus, on the other hand, was a 5th-century BC Greek philosopher. He conducted no experimental work as far as we know, and none of his publications have survived. He postulated that matter was made up of a single indivisible element known as an atom; the word atom originates from the Greek word oos, which meaning "uncuttable" or "indivisible." So the name atom might be a homage to Democritus.

Answer:

H+ (hydrogen) ions

Explanation:

Answer:

H+ (hydrogen) ions

Explanation:

Answer:

Blue!!

I think it is blue!

is it blue cuz i think its blue